BDNF and infection: Therefore, this study is aimed to define the incidence of suicide re-attempt in young first-attempters, and to investigate the association between socio-demographic, clinical, and biological (HPA axis activity with blood and hair cortisol, pro-inflammatory markers with CRP, fibrinogen, orosomucoid and IL-6, infection with toxoplasma gondii, and neuroplasticity imbalance measured by the proportion of mature, and pro-BDNF isoforms) variables.